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Schedule VI - Supplemental Information Concerning Consolidated Property and Casualty Insurance Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract]                        
Reserves for Unpaid Losses and LAE $ 472,829       $ 248,425       $ 472,829 $ 248,425 $ 58,494 $ 98,840
Incurred Loss and LAE Current Year                 314,933 322,929 305,919  
Incurred Loss and LAE Prior Years                 99,522 27,499 (4,690)  
Paid Losses and LAE                 401,011 342,796 328,141  
Net Investment Income 7,603 $ 6,642 $ 5,786 $ 4,785 4,448 $ 3,085 $ 3,223 $ 2,704 24,816 13,460 9,540  
Deferred Policy Acquisition Cost (“DPAC”) 84,686       73,059       84,686 73,059 64,912 $ 60,019
Amortization of DPAC, Net                 163,187 136,702 125,350  
Net Premiums Written                 827,674 737,060 656,094  
Net Premiums Earned 204,595 $ 188,938 $ 192,272 $ 182,577 183,708 $ 174,517 $ 169,009 $ 161,559 768,382 688,793 632,416  
Unearned premiums $ 601,679       $ 532,444       $ 601,679 $ 532,444 $ 475,756